Biology Today — January 2018

Semen Secretion of the male accessory glands, i.e., seminal vesicles, prostate gland and Cowper’s glands and sperms from testes ...

Fig.: Events in spermatogenesis Each spermatogonium produces four haploid sperms, having half the number of chromosomes. Fertili ...

Post acrosomal sheath Fibrous sheath Axial filament (9+2 fibrils) Ring centriole (Annulus) Head Neck Very short, contains proxim ...

Disorders of male reproductive system Prostatitis It is the inflammation of prostate generally caused by infection. Prostatitis ...

Read the following statements and select the correct option. I. ADAM (Androgen Deficiency in Ageing Males) is also called male ...

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Which one of the following statements is not true with respect to viability of mammalian sperm? (a) Viability of sperm is deter ...

(b) If both A and R are true but R is not the correct explanation of A. (c) If A is true but R is false. (d) If both A and R are ...

CHAPTER-5 : PRINCIPLES OF INHERITANCE AND VARIATION Multiple Choice Questions If the factors responsible for pod shape and pod ...

P Q R (a) Female Metafemale Male (b) Male Female Metafemale (c) Female Male Intersex (d) Metamale Female Male If the recombinat ...

Figure Based Questions Consider the given cross and answer the following questions. XXh × XY Mother Father Parents: Gametes: O ...

Select the correct statement regarding repression of genes. (a) It refers to switching on of operon that usually remains turned ...

Assertion : A peptide bond (–CO – NH_) is established between the amino group (–NH 2 ) of amino acid at P site, and carboxyl gr ...

people remained to form the next generation. This kind of change in the gene pool is called (a) Hardy-Weinberg equilibrium (b) b ...

Assertion & Reason In each of the following questions, a statement of Assertion (A) is given and a corresponding statement o ...

(b) In the given figure, W represents deletion. It is the loss of an intercalary segment of a chromosome which is produced by a ...

EVOLUTION-II Analysis of various PMTs from 2013-2017 2013 2014 2015 2016 2017 AIPMT/NEET 2 2 1 4 AIIMS 1 2 2 AMU 4 ...

Effect of environment and new needs Environment influences all types of organisms. A change in environment brings about changes ...